Frame of bicycle



FIG. 1 is a perspective view of a frame of bicycle showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a flat top view thereof; and,

FIG. 7 is a flat bottom view thereof. 

The ornamental design for a frame of bicycle, as shown. 